Charge-exchange processes in fast collisions of Fq+ (q=2–9) on Ne and Ar gas targets have been studied using the projectile–recoil-ion coincidence method. The target ionization without a projectile charge change increases with increasing projectile charge approximately as ∼q1.4. This dependence is weaker than the q2 dependence predicted by the first Born approximation because of the large ionization probabilities involved. The single-electron-capture cross sections follow the known q3 scaling law, while the double-electron-capture cross sections display a q6 dependence, as predicted by the independent-electron approximation for small capture probabilities. Single- and double-electron loss from the L shell decreases with increasing q mainly because of the decrease in the number of L-shell electrons, while binding-energy effects play only a minor role. In contrast, the large sudden decrease in electron-loss cross sections once K-shell electrons must be removed is due to the large increase in binding energy.